The average height of 10 students is 155 cm. Later on it is discovered that while calculating the average, the reading of 157 cm was wrongly read as 147cm .The correct average is:
Correct answer: D. 156
- A. 196
- B. 154
- C. 200
- D. 156
Explanation
A, B, C are incorrect as 156cm is the correct average height D is correct as Total height of 10 students = 10 x 155 = 1550 cm Since 157cm was incorrectly read as 147cm 1550 - 147 + 157 = 1560 1560/10 =156cm
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About Quantitative Reasoning
Quantitative reasoning applies arithmetic and basic algebra to numerical relationships, including percentages, ratios, averages, fractions, proportions, profit and loss, rates, time, work and measurement. Questions focus on translating words into equations, choosing an efficient method and checking whether the result is numerically reasonable.
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